|No.|Date|Location|Surface|Opponent in final|Score|
|---|---|---|---|---|---|
|1.|28 August 2000|Spoleto, Italy $10,000|Clay|Maret Ani|6–2 7–6(7)|
|2.|9 April 2001|San Luis Potosí, Mexico $25,000|Clay|Martina Müller|6–4 7–5|
|3.|16 April 2001|Coatzacoalcos, Mexico $25,000|Hard|Gabriela Voleková|6–1 6–3|
|4.|15 October 2002|Sedona, USA $25,000|Hard|Brie Rippner|6–3 4–6 6–3|
|5.|5 November 2002|Pittsburgh, USA $50,000|Hard|Maria Sharapova|7–6(4) 6–2|
|6.|14 April 2003|San Luis Potosí, Mexico $25,000|Clay|Maria Vanina Garcia Sokol|6–0 6–4|
|7.|27 April 2009|Cagnes-sur-Mer, France $100,000|Clay|Zuzana Ondrášková|6–1–6–2|
|8.|1 June 2009|Nottingham, England $50,000|Grass|Stefanie Vögele|6–2 4–6 6–1|

Question: how many matches were not played on a clay surface?
Answer: 4